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NATE (North American Technician Excellence) certification is not legally required for HVAC technicians in most areas, but hiring a professional with this certification is highly recommended. NATE-certified technicians demonstrated their expertise and proficiency in different types of HVAC systems, offering assurance of quality service. It's a voluntary certification, yet it indicates a commitment to professionalism and ongoing training. Choosing a NATE-certified technician often means you're working with someone who is up-to-date on industry standards and best practices, which can lead to better service, energy efficiency, and long-term cost savings.

You can use a pressure washer to clean the outdoor condenser coils if the dirt buildup is too heavy for a garden hose and sprayer. Use a gentle setting on your pressure washer to avoid damage to the coils and fins. Do not use a pressure washer on indoor evaporator coils.

If you don't regularly change your HVAC air filter, it will become clogged with dust, dirt, and other contaminants. This blockage forces the system to work harder to circulate air, leading to several negative consequences. You may experience higher energy bills, poor temperature regulation, reduced air quality, and slower system performance. Over time, this added strain can cause parts to break more frequently, lead to system failure, and ultimately shorten the lifespan of your entire HVAC unit. In some cases, it can also contribute to health problems. It's recommended to change the filter at least every three months.

A correctly installed air filter will fit snugly in its compartment. One that’s too thick or big won’t lie smoothly, and it can block the airflow, sometimes resulting in strange noises. A filter that’s too small or improperly fitted may move around in the compartment, resulting in strange humming or vibration noises. Poor fitting can eventually cause a buildup of dirt in the HVAC ductwork, and reduced indoor air quality can lead to sneezing or excess dust on your surfaces.